Baixei o projeto e não fiz nada, só dei CTRL + F5 no arquivo Alura.WebAPI.Api e ele mostra a seguinte mensagem no Console:

Error:
  An assembly specified in the application dependencies manifest (Alura.WebAPI.Api.deps.json) was not found:
    package: 'Alura.WebAPI.DAL.Livros', version: '1.0.0'
    path: 'Alura.WebAPI.DAL.Livros.dll'

O C:\Program Files\dotnet\dotnet.exe (processo 10496) foi encerrado com o código -2147450740.
Pressione qualquer tecla para fechar esta janela...

Versões do .Net instaladas na minha maquina:

SDK do .NET (refletindo qualquer global.json):
 Version:   5.0.202
 Commit:    db7cc87d51

Ambiente de runtime:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.202\

Host (useful for support):
  Version: 5.0.5
  Commit:  2f740adc14

.NET SDKs installed:
  2.1.815 [C:\Program Files\dotnet\sdk]
  3.1.408 [C:\Program Files\dotnet\sdk]
  5.0.202 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]